Opera set in Egypt (4)
I believe the answer is:
aida
'opera set in egypt' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for aida that I've seen before include "Verdi's Egyptian opera" , "slave of Covent Garden" , "She dies with Radams (Verdi)" , "title role" , "she dies entombed" .)